黄冈小状元四年级简便计算思考题!(1)66 X 21 + 19 X 21 + 85 X 19(2) 36 X 111 + 888 X 8(3)99 X 99 +199脱式计算的!黄冈小状元四年级下23页的!回答完整50分!
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![黄冈小状元四年级简便计算思考题!(1)66 X 21 + 19 X 21 + 85 X 19(2) 36 X 111 + 888 X 8(3)99 X 99 +199脱式计算的!黄冈小状元四年级下23页的!回答完整50分!](/uploads/image/z/748210-58-0.jpg?t=%E9%BB%84%E5%86%88%E5%B0%8F%E7%8A%B6%E5%85%83%E5%9B%9B%E5%B9%B4%E7%BA%A7%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E6%80%9D%E8%80%83%E9%A2%98%21%EF%BC%881%EF%BC%8966+X+21+%2B+19+X+21+%2B+85+X+19%282%29+36+X+111+%2B+888+X+8%283%2999+X+99+%2B199%E8%84%B1%E5%BC%8F%E8%AE%A1%E7%AE%97%E7%9A%84%21%E9%BB%84%E5%86%88%E5%B0%8F%E7%8A%B6%E5%85%83%E5%9B%9B%E5%B9%B4%E7%BA%A7%E4%B8%8B23%E9%A1%B5%E7%9A%84%21%E5%9B%9E%E7%AD%94%E5%AE%8C%E6%95%B450%E5%88%86%21)
黄冈小状元四年级简便计算思考题!(1)66 X 21 + 19 X 21 + 85 X 19(2) 36 X 111 + 888 X 8(3)99 X 99 +199脱式计算的!黄冈小状元四年级下23页的!回答完整50分!
黄冈小状元四年级简便计算思考题!
(1)66 X 21 + 19 X 21 + 85 X 19
(2) 36 X 111 + 888 X 8
(3)99 X 99 +199
脱式计算的!黄冈小状元四年级下23页的!
回答完整50分!
黄冈小状元四年级简便计算思考题!(1)66 X 21 + 19 X 21 + 85 X 19(2) 36 X 111 + 888 X 8(3)99 X 99 +199脱式计算的!黄冈小状元四年级下23页的!回答完整50分!
(1)66 X 21 + 19 X 21 + 85 X 19
=(66+19)*21+85*19
=85*21+85*19
=85*(21+19)
=85*40
=3400
(2) 36 X 111 + 888 X 8
=36*111+111*8*8
=36*111+111*64
=(36+64)*111
=100*111
=11100
(3)99 X 99 +199
=99*99+100+99
=99*(99+1)+100
=99*100+100
=9900+100
=10000
1
66*21+19*21+85*19
=[66+19]*21+85*19
=3400
(1)66 X 21 + 19 X 21 + 85 X 19
=(66×21+19 X 21 )+ 85 X 19
=(66+19)×21+ 85 X 19
=85×21 +85 X 19
=85×(21+19)
=85×40
=(80+5)×40
=80×40+5×40
=3200+200
=3200
(2) 36...
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(1)66 X 21 + 19 X 21 + 85 X 19
=(66×21+19 X 21 )+ 85 X 19
=(66+19)×21+ 85 X 19
=85×21 +85 X 19
=85×(21+19)
=85×40
=(80+5)×40
=80×40+5×40
=3200+200
=3200
(2) 36 X 111 + 888 X 8
=36 X 111 + (8×111) X 8
=36 X 111 + (8×8) X 111
=36 X 111 + 64 X 111
=(36+64)×111
=100×111
=11100
(3)99 X 99 +199
=99 X 99 +(100+99)
=99 X 99+99+100
=99 X 99+99×1+100×1
=99×(99+1)+100×1
=99×100+1×100
=(99+1)×100
=100×100
=10000
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