Question

4.2x4.2十11.6x4.2-15.8x2简便计算？

Answer 1

你好此题简便运算方法为4.2x4.2+11.6x4.2-15.8x2=（11.6+4.2）x4.2-15.8x2=15.8x4.2-15.8x2=15.8x（4.2-2）=15.8x2.2=34.76

Answer 2

4.2×4.2+11.6×4.2-15.8×2
=4.2×（4.2+11.6）-15.8×2
=4.2×15.8-15.8×2
=15.8×（4.2-2）
=15.8×2.2
=15.8×2+15.8×0.2
=31.6+3.16
=34.76

Answer 3

前两项可以用乘法分配律，等于4.2×（4.2+11.6）-15.8×2＝4.2×15.8-15.8×2；再使用乘法分配律，＝15.8×（4.2-2）＝15.8×2.2＝34.76

Answer 4

4.2x4.2+11.6x4.2-15.8x2
=（11.6+4.2）x4.2-15.8x2
=15.8x4.2-15.8x2
=15.8x（4.2-2）
=15.8x2.2
=34.76

Answer 5

4.2*4.2+11.6*4.2-15.8*2
=4.2*(4.2+11.6)-15.8*2
=4.2*15.8-15.8*2
=(4.2-2)*15.8
=2.2*15.8
=34.76