Question

4.2乘以7.8+22乘以0.42这个怎么简便

Answer 1

4.2乘以7.8+22乘以0.42
=4.2×(7.8+2.2)
=4.2×10
=42;

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Answer 2

4.2乘以7.8乘以2.2乘以4.2
=4.2乘以（7.8+2.2）
=4.2乘以10
=42

Answer 3

原式=0.42×78+22×0.42

=0.42×(78+22)

=0.42×100

=42
或：=4.2×7.8+2.2×4.2

=4.2×(7.8+2.2)

=4.2×10

=42

Answer 4

4.2×7.8+22×0.42
=4.2×7.8+2.2×4.2
=4.2×（7.8+2.2）
=4.2×10
=42